changed interactive mode to xterm.js

main.go

@@ -515,7 +515,8 @@ func terminalHandler (w http.ResponseWriter, r *http.Request) {
 		return
 	}
 	defer func() { _ = ptmx.Close() }()
-	ptmx.Write([]byte("stty raw -echo\n"))
+	// ptmx.Write([]byte("stty raw -echo\n"))
+	// ptmx.Write([]byte("stty -echo\n"))
 	// ptmx.Write([]byte("export SHELL=bash 1>&2 2>/dev/null; export TERM=xterm-256color 1>&2 2>/dev/null"))
 
 	go func() {

static/start-interactive.js

@@ -1,16 +1,12 @@
 document.addEventListener("DOMContentLoaded", function () {
   const input = document.getElementById("command-input");
-  const terminal = document.getElementById("terminal");
+  // We assume your normal terminal UI is in the element with id "terminal".
+  const normalTerminal = document.getElementById("terminal");
   let interactiveWS = null;
   let interactiveMode = false;
-  let lastKeySentTime = 0;
-  const throttleInterval = 50; // milliseconds
-
-  // Holds the user’s input on the current line.
-  let currentLineBuffer = "";
-  let currentLineElem = null;
   const ansi_up = new AnsiUp;
 
+  // Listen for the "start-interactive" command in normal mode.
   input.addEventListener("keydown", function (event) {
     if (!interactiveMode && event.key === "Enter") {
       const command = input.value.trim();
@@ -20,150 +16,82 @@ document.addEventListener("DOMContentLoaded", function () {
         event.preventDefault();
         return;
       }
-      // Otherwise, normal HTTP submission…
+      // Otherwise, your normal HTTP submission…
     }
   });
 
   function startInteractiveSession() {
-    interactiveWS = new WebSocket("ws://" + location.host + "/terminal");
+    // Hide the normal terminal and input.
-    interactiveMode = true;
+    normalTerminal.style.display = "none";
-    terminal.insertAdjacentHTML('beforeend', "\n--- Interactive session started ---\n");
+    input.style.display = "none";
-    input.style.display = "none";  // Hide normal input.
-    currentLineBuffer = "";
-    createCurrentLineElem();
 
+    // Create a new container for xterm.js.
+    const xtermContainer = document.createElement("div");
+    xtermContainer.id = "xterm-container";
+    xtermContainer.style.width = "100%";
+    xtermContainer.style.height = "100vh";
+    // Optionally set additional styling (e.g. background color).
+    document.body.appendChild(xtermContainer);
+
+    // Initialize xterm.js Terminal.
+    const term = new Terminal({
+      cursorBlink: true,
+      scrollback: 1000,
+      theme: {
+        background: "#222",
+        foreground: "#eee"
+      }
+    });
+    const fitAddon = new FitAddon.FitAddon();
+    term.loadAddon(fitAddon);
+    term.open(xtermContainer);
+    fitAddon.fit();
+    term.focus();
+
+    // Establish the WebSocket connection.
+    interactiveWS = new WebSocket("ws://" + location.host + "/terminal");
     interactiveWS.binaryType = "arraybuffer";
 
     interactiveWS.onmessage = function (event) {
-      // When the shell returns output (for example, after Enter), process it.
+      const text = new TextDecoder("utf-8").decode(event.data);
-      let text = new TextDecoder("utf-8").decode(event.data);
+      term.write(text);
-      text = removeOSCTitle(text);
-      processPTYOutput(text);
     };
 
     interactiveWS.onclose = function () {
       interactiveMode = false;
-      terminal.insertAdjacentHTML('beforeend', "\n--- Interactive session ended ---\n");
+      term.write("\r\n--- Interactive session ended ---\r\n");
+      // Remove the xterm container.
+      if (xtermContainer.parentNode) {
+        xtermContainer.parentNode.removeChild(xtermContainer);
+      }
+      // Restore the normal terminal UI.
+      normalTerminal.style.display = "block";
       input.style.display = "block";
       input.focus();
-      document.removeEventListener("keydown", handleInteractiveKey, true);
     };
 
     interactiveWS.onerror = function (err) {
-      terminal.insertAdjacentHTML('beforeend', "\n--- Error in interactive session ---\n");
+      term.write("\r\n--- Error in interactive session ---\r\n");
       console.error("Interactive WS error:", err);
       interactiveMode = false;
+      if (xtermContainer.parentNode) {
+        xtermContainer.parentNode.removeChild(xtermContainer);
+      }
+      normalTerminal.style.display = "block";
       input.style.display = "block";
-      document.removeEventListener("keydown", handleInteractiveKey, true);
     };
 
-    // Listen for all key events while in interactive mode.
+    // When the user types in xterm, send the data to the server.
-    document.addEventListener("keydown", handleInteractiveKey, true);
+    term.onData(function (data) {
-  }
+      // If the user presses Ctrl+D (ASCII 4), exit the session.
-
+      if (data === "\x04") {
-  // Process output received from the PTY.
+        term.write("\r\n--- Exiting interactive session ---\r\n");
-  // We expect output to include completed lines (with newline) as command results.
+        interactiveWS.close();
-  function processPTYOutput(text) {
-    // Split output into lines.
-    const parts = text.split("\n");
-    for (let i = 0; i < parts.length; i++) {
-      const processedPart = processBackspaces(parts[i]);
-      if (i < parts.length - 1) {
-        // Completed line.
-        currentLineBuffer += processedPart;
-        const finishedLine = document.createElement("div");
-        finishedLine.innerHTML = ansi_up.ansi_to_html(currentLineBuffer);
-        terminal.appendChild(finishedLine);
-        currentLineBuffer = "";
-        createCurrentLineElem();
       } else {
-        // Incomplete line.
+        interactiveWS.send(data);
-        currentLineBuffer += processedPart;
       }
-    }
+    });
-    updateCurrentLine();
-  }
 
-  // Update the current line element with the current buffer and a blinking cursor.
+    interactiveMode = true;
-  function updateCurrentLine() {
-    if (currentLineElem) {
-      currentLineElem.innerHTML = ansi_up.ansi_to_html(currentLineBuffer);
-      updateCursor();
-    }
-    terminal.scrollTop = terminal.scrollHeight;
-  }
-
-  // Create (or recreate) the current line element.
-  function createCurrentLineElem() {
-    if (currentLineElem && currentLineElem.parentNode) {
-      currentLineElem.parentNode.removeChild(currentLineElem);
-    }
-    currentLineElem = document.createElement("span");
-    currentLineElem.id = "current-line";
-    // Ensure the current line element is inline so the cursor stays on the same line.
-    currentLineElem.style.display = "inline";
-    terminal.appendChild(currentLineElem);
-  }
-
-  // Append a blinking cursor to the current line.
-  function updateCursor() {
-    const existingCursor = currentLineElem.querySelector(".cursor");
-    if (existingCursor) {
-      existingCursor.parentNode.removeChild(existingCursor);
-    }
-    currentLineElem.insertAdjacentHTML('beforeend', '<span class="cursor">█</span>');
-  }
-
-  // Throttled key handler that updates the local current line buffer and sends keys to the PTY.
-  function handleInteractiveKey(event) {
-    if (!interactiveMode || !interactiveWS || interactiveWS.readyState !== WebSocket.OPEN)
-      return;
-    const now = Date.now();
-    if (now - lastKeySentTime < throttleInterval) {
-      event.preventDefault();
-      return;
-    }
-    lastKeySentTime = now;
-    let data = "";
-    if (event.key === "Enter") {
-      data = "\n";
-      // Append newline to the local buffer and clear it
-      currentLineBuffer += "\n";
-      updateCurrentLine();
-      currentLineBuffer = "";
-    } else if (event.key === "Backspace") {
-      data = "\x7f"; // DEL
-      // Update the local buffer: remove the last character.
-      currentLineBuffer = currentLineBuffer.slice(0, -1);
-      updateCurrentLine();
-    } else if (event.key.length === 1) {
-      data = event.key;
-      currentLineBuffer += event.key;
-      updateCurrentLine();
-    } else {
-      return;
-    }
-    interactiveWS.send(data);
-    event.preventDefault();
-  }
-
-  // Remove OSC sequences (for terminal title updates).
-  function removeOSCTitle(text) {
-    const oscRegex = /\x1b\]0;.*?(?:\x07|\x1b\\)/g;
-    return text.replace(oscRegex, "");
-  }
-
-  // Process backspace characters in a string (for PTY output).
-  function processBackspaces(text) {
-    let result = "";
-    for (let i = 0; i < text.length; i++) {
-      const ch = text[i];
-      if (ch === "\x7f" || ch === "\b") {
-        result = result.slice(0, -1);
-      } else {
-        result += ch;
-      }
-    }
-    return result;
   }
 });

templates/index.html

@@ -9,6 +9,11 @@
 	<script type="text/javascript" src="static/switch-themes.js"></script>
 	<script type="text/javascript" src="static/start-interactive.js"></script>
 	<script src="https://cdn.jsdelivr.net/npm/ansi_up@5.0.0/ansi_up.min.js"></script>
+
+    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/xterm/css/xterm.css" />
+    <script src="https://cdn.jsdelivr.net/npm/xterm/lib/xterm.js"></script>
+    <script src="https://cdn.jsdelivr.net/npm/xterm-addon-fit/lib/xterm-addon-fit.js"></script>
+
 	<link rel="stylesheet" type="text/css" href="static/stylesheet.css">
 </head>
 <body>